Overview
Manuals
Working principle
Core Application Areas
Features:
- High Speed Transformer Protection Relay
- GE Multilin 745 Transformer Protection System
- Microprocessor-based relay used for protecting and managing small to large power
This model integrates high-speed protection, monitoring, and fault diagnosis functions, specifically designed for comprehensive protection of two- or three-winding power transformers. It effectively prevents overcurrent, overtemperature, and internal short-circuit faults, and automatically compensates for the current transformer (CT) ratio and phase difference through advanced algorithms.
Its HI high-voltage power adapter and T-enhanced backlit display ensure stable power supply and a clear human-machine interface even in complex substation environments, helping operators quickly read operating status or adjust parameters.
The SR745-CASE 745-W2-P5-G5-HI-T General Electric Transformer Protection Relay may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
General Electric SR745-CASE 745-W2-P5-G5-HI-T Transformer Protection Relay INFO(manual), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
It collects the current and voltage waveforms on both sides of the transformer in real time and calculates the differential current using an internal algorithm. During normal operation, the vector sum of the inflow and outflow currents is close to zero; once an internal fault occurs, the balance is broken, and the relay will identify the differential value within milliseconds and trigger a trip. At the same time, it uses harmonic suppression technology (especially second harmonic suppression) to distinguish between transformer surge current and true internal faults, thereby preventing faults from occurring during no-load closing.
- Dual-Winding Power Transformers: Their specific hardware configuration (W2) is optimized for standard dual-winding transformers commonly found in distribution and transmission substations.
- Industrial Plants: Used in heavy industries such as metallurgy, petrochemicals, and machinery manufacturing to protect critical process transformers from overcurrent and differential faults.
- Renewable Energy: Applied to wind and solar power plants to manage unique variables and harmonics common in renewable energy grids.
- Automated Substation Control: Can be used as a standalone protector or as a communication-intensive component in large automated power grids, supporting real-time monitoring via its Ethernet (T) port using the Modbus TCP/IP protocol.
